Improvement in turn-bridges



UNITED STATES PATENT OFFICE.

JAMES INGERSOLL, F.GRAFTON, OHIO.

IMPROVEMENT IN TU PtN-BRIDGES.

Specification forming part-of Letters Patent No. 38,966, dated June 23, 1863.

To aZZ whom it may concern:

Be it known that I, JAMES INGERsoLL, of Grafton, in the county of Lorain and State of Ohio, have invented a new and useful Improvement in Turn-Bridges; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Eigure l is a side sectional view of my invention, the plane of section passing through the center; Fig. 2, a plan or top view of the same, with the| cap removed.

Similar letters ot' reference indicate corresponding parts in the two figures.

This invention consists in having the bridge attached to a turn-table, which is placed on a suitable foundation, the turn-table encompassing the base of a tower, on the top of which there is fitted another turn-table, to which rods are attached, said rods being connected to and supporting the outer part of the bridge, all being arranged in such a manner as to form a simple, economical, and durable turn-bridge.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents the upper part of a foundation, which may be constructed in any proper way to support properly the parts which it is to sustain.

B isaturn-table, which is composed of an annular platform, a, which rests on conical rollers b, the latter being placed on radial shafts c, fitted between two circular concentric rims, d d. The rollers b work in annular grooves e, made in the upper surface of the foundation and in the under surface of the platform a, annular grooves f also being made concentric with the grooves e to receive the edges of the rims d d. The rollers b, arranged as shown, admit of the turn-table B working freely on the foundation. y

C represents a tower, which may be constructed of any suitable material, and in any proper way, to insure the requisite degree of strength. This tower is built on the foundation A, its base being encompassed by the turn-table B, as shown clearly in Fig. l.

D is the bridge, which is attached to the turn-table B, and is supported at its outer end by rods E, the upper ends on which are attached to a turn-table, F, on the top of the tower C. This turn-table is constructed precisely like the turn-table B, as will be seen by referring t0 Fig. 1, b indicating the rollers, fitted radially between circular rims d' d. 1t' the bridge D is at one side of the turn-table B, it may be counterpoised atthe opposite side, and in narrow bridges, provided with one passage only, the latter may pass through the tower C, audit' side passages are used the latter may be at the outer sides of the tower. By this arrangement it will be seen that the bridge may be turned with the greatest facility, as the turn-tables obviate much friction, and, at the same time, it will be seen that a very simple and economical turn-bridge is obtained.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The bridge D, in connection with the tower C and turn-tables B and F, all arranged to operate substantially as set forth.

A JAMES INGERSOLL.

Witnesses:

CLEMENT STEEBINS, GEO. l). WILLIAMS. 

